Many men have developed the habit of smoking and drinking since they were teenagers, and over time, they have become persistent “smokers” or “alcoholics”. This can cause lifelong infertility. First of all, cigarettes and alcohol can damage the male sexual function, thus causing male infertility. Smoking is a common risk factor for causing arterial vascular damage in men, especially atherosclerosis. After atherosclerosis, the blood pressure index of the penis decreases significantly, and blood input decreases significantly, thus inducing impotence. Alcohol consumption also has a very harmful effect on male sexual function. Alcohol can cause gonadal toxicity, severely damage testicular interstitial cells, inhibit the synthesis of testosterone, so that the level of androgen is reduced, resulting in serious. Secondly, tobacco and alcohol can directly damage the gonads and sperm. Sperm production depends on the function of the gonads, mainly the testes; at the same time, spermatogenesis is manifested as a sharp increase in the number of cells and cell differentiation and maturation, a process that requires a large number of deoxyribonucleic acid (DNA) and proteins, while cigarette smoke concentrates contain substances that induce cellular aberrations and impede the synthesis of DNA by lymphocytes, which have a significant impact on spermatogenesis, maturation, and the proportion of abnormal sperm. Impact. Studies have shown that the percentage of malformed spermatozoa in the semen of smokers is much higher than that of non-smokers. Alcohol causes a decrease in serum testosterone levels by poisoning testes and other reproductive organs, thus causing loss of libido and sperm deformities, leading to male infertility. Therefore, in order to protect normal male fertility, it is necessary to resolutely quit smoking and alcohol.